.demo{
	overflow:hidden;
	position:absolute;
	left:50%;
	width:754px;
	margin-left:-380px;
	top:50%;
	height:394px;
	margin-top:-197px;
}

.treeintroduce{
	background:#000 url(${servletURL}?op=resource&resource=/com/fr/web/platform/images/img1.jpg) no-repeat;
	width:510px;
	height:387px;
	float:left;
	position:relative;
	left:0px;
	cursor:pointer;
}
.serverintroduce{
	background:#EEF3F7 url(${servletURL}?op=resource&resource=/com/fr/web/platform/images/server_m_right.jpg) no-repeat;
	width:118px;
	height:387px;
	float:left;
	position:relative;
	left:0px;
	cursor:pointer;
}
.roleintroduce{
	background:url(${servletURL}?op=resource&resource=/com/fr/web/platform/images/role_m.jpg) no-repeat;
	width:118px;
	height:387px;
	float:left;
	position:relative;
	left:0px;
	cursor:pointer;
}
.shadow_right{
	background:url(${servletURL}?op=resource&resource=/com/fr/web/platform/images/shadow_right.jpg) no-repeat;
	width:8px;
	height:387px;
	float:left;
	position:relative;
}
.shadow_bottom{
	clear:both;
	background:url(${servletURL}?op=resource&resource=/com/fr/web/platform/images/shadow_bottom.gif) no-repeat;
	width:753px;
	height:7px;
}